retr0.id
A from-scratch atproto PDS implementation in Python (mirrors https://github.com/DavidBuchanan314/millipds)
Merge pull request #53 from DavidBuchanan314/nondeterminstic-ecdsa
copilot: Refactor ECDSA signing to use non-deterministic signing method
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src/millipds/crypto.py
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src/millipds/crypto.py
···
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ec.SECP256R1: b"\x80\x24", # varint(0x1200)
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}
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DETERMINISTIC_ECDSA_SHA256 = ec.ECDSA(
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hashes.SHA256(), deterministic_signing=True
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)
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ECDSA_SHA256 = ec.ECDSA(hashes.SHA256())
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def apply_low_s_mitigation(dss_sig: bytes, curve: ec.EllipticCurve) -> bytes:
···
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def raw_sign(privkey: ec.EllipticCurvePrivateKey, data: bytes) -> bytes:
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r, s = decode_dss_signature(
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apply_low_s_mitigation(
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privkey.sign(data, DETERMINISTIC_ECDSA_SHA256), privkey.curve
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privkey.sign(data, ECDSA_SHA256), privkey.curve
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)
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)
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signature = r.to_bytes(32, "big") + s.to_bytes(32, "big")